(a) Use Rydberg formula to calculate the wavelengths of the four
visible lines in the
Balmer series of light emitted by a hydrogen gas-discharge lamp. A
diffraction grating of
width 1 cm has 2500 slits. It is used to measure the wavelengths of
the visible spectrum of
hydrogen. (b) Determine the first-order diffraction angles of the
four observed lines. (c)
What is the angular width of each one of them?
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